Paint compound.



I06. COMPOSITIONS,

COATING OR PLASTIC Cross Reference CHARLES J. MCLENNAN, OF DETROIT, MICHIGAN.

PAINT COMPOUND.

To all whom it may concern:

Be it known that 1, CHARLES J. MCLEN- NAN, a citizen of the United States, residing at Detroit, county of Wayne, State of Michian, have invented a certain new and useful mprovement in Paint Compounds, and declare the following specification to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same.

This invention relates to aint; it has for its object an improved com ination of substances to be used as a paint for the preservation or ornamental coating of articles of wood, or other material with which such coatings are commonly and usually used.

The combination of materials is as follows :one-half pint of bichromate of soda; three pints solution 0 s1 mate 0 so( a; twelve pints of water; one pint 0 seed oil; one-half pound of glue, and approximately five pounds of pigment.

The amount of the pigment varies somewhat, dependent u on the specific gravity thereof, as the li ui constituents will suiiice for a larger weig t for an article of greater specific gravity, and will suflice for a less amount in weight for anarticle of less specific gravity.

In com ound' the paint, I first mix the silicate o soda so ution with about one-half of the water, then add the linseed oil with active agitatlon thereby breaking up the oil globules, and emulsifying the same. I then add the bichromate of soda, which has been previously dissolved in about oneuarter of the water; the two solutions are t en thoroughly mixed; next the glue, dissolved in the remainder of the water, is added and thoroughly mixed. I then add the Specification of Letters Patent.

Application filed September 9.1907- Serial No. 891.904.

desired pig- Patented Dec. 3, 1907.

ment, such as carbonate of lime, china clav, Venetian red, F rencli ggay, ye ow 00 'e, or any suitable pigment.

The action of GhIOIDJC acid and bichromates in forming insoluble compounds in gelatin is well known, but in carrying out this invention the neutral chromate is formed by combiningt e am 0 omate with txamim sodium of the silicate, by this combination also some of the silicate is set free as silicic acid but the silicic ac1d is not precipitated, ut remains in the colloid form in solution;

in time this would separate and agglutinate' as gelatinous hydrated silicate, were it not for the presence of the oily globules, which retard or prevent such molecular action; the oil also aids in forming the insoluble chromium gelatin combination by absorbing a portion of the available oxygen from the chromate on exposure to the light, reducing it (the chromate) to a lower state of oxidation, thus enabling it to unite with the gelatin. Other oils capable of absorbing oxygen and drying may be-used in place of linseed oil, such as rape seed, china wood oil, etc., but I prefer msee oil. So also other bichromates as bichromate g1 pgtash could be used, but the so ium chromate is the most available at the present time. a

What I claim 1s:'

A paint, composed of bichromate of soda, silicate of soda, linseed oil, glue, water, and pigment in substantially the proportion specified.

In testimony whereof, I sign this specification in the presence of two witnesses.

CHARLES J. MCLENNAN.

Witnesses:

ALIcn Townsnnn, ELLro'rr J. STQDDARD. 

